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Portable Helicopter Oxygen Delivery System (PHODS)

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The Portable Helicopter Oxygen Delivery SystemPHODS set with optional oxygen mask
(PHODS) is a man-mounted oxygen system that can be attached directly to a crew member's flight vest and helmet to support flight and ground missions at high altitudes. The oxygen cylinder is a 3AA 4130X steel cylinder that is placed in a pocket made from flame resistant material and mounted on the flight vest. The oxygen is delivered from the cylinder with a first stage regulator to the user through a rubber nasal cannula or face mask. Oxygen delivery is managed by the OPC-M1 Pulse Demand Oxygen unit, powered by two AA batteries. The Oxygen Pulse Controller (OPC) automatically provides a predetermined amount of oxygen when it senses a pressure differential caused by the user's breathing. The OPC-M1 regulator has an internal barometer to detect altitude and becomes active and de-active at preset altitudes. When the system is turned on, it becomes active/delivers oxygen above 10,000 feet (ft) pressure altitude (PA) and stops delivering oxygen when the altitude drops below 8,500 ft PA. The PHODS is designed for AH-64, UH-60 AND CH-47 crews and for altitudes up to 18,000 ft.

(Refer to U.S. Army Doc. AR 95-1 for usage and aeromedical requirements.)

PHODS parts description